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Diffstat (limited to 'xlators/storage/bdb/src/bdb.h')
| -rw-r--r-- | xlators/storage/bdb/src/bdb.h | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/xlators/storage/bdb/src/bdb.h b/xlators/storage/bdb/src/bdb.h new file mode 100644 index 000000000..f2d962680 --- /dev/null +++ b/xlators/storage/bdb/src/bdb.h @@ -0,0 +1,439 @@ +/* + Copyright (c) 2008, 2009 Z RESEARCH, Inc. <http://www.zresearch.com> + This file is part of GlusterFS. + + GlusterFS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3 of the License, + or (at your option) any later version. + + GlusterFS is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. +*/ + +#ifndef _BDB_H +#define _BDB_H + +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + +#include <stdio.h> +#include <dirent.h> +#include <unistd.h> +#include <sys/types.h> +#include <dirent.h> + +#include <db.h> + +#ifdef linux +#ifdef __GLIBC__ +#include <sys/fsuid.h> +#else +#include <unistd.h> +#endif +#endif + +#ifdef HAVE_SYS_XATTR_H +#include <sys/xattr.h> +#endif + +#ifdef HAVE_SYS_EXTATTR_H +#include <sys/extattr.h> +#endif + +#include <pthread.h> +#include "xlator.h" +#include "inode.h" +#include "compat.h" +#include "compat-errno.h" + +#define GLFS_BDB_STORAGE "/glusterfs_storage.db" + +/* numbers are not so reader-friendly, so lets have ON and OFF macros */ +#define ON 1 +#define OFF 0 + +#define BDB_DEFAULT_LRU_LIMIT 100 +#define BDB_DEFAULT_HASH_SIZE 100 + +#define BDB_ENOSPC_THRESHOLD 25600 + +#define BDB_DEFAULT_CHECKPOINT_TIMEOUT 30 + +#define BCTX_ENV(bctx) (bctx->table->dbenv) +/* MAKE_REAL_PATH(var,this,path) + * make the real path on the underlying file-system + * + * @var: destination to hold the real path + * @this: pointer to xlator_t corresponding to bdb xlator + * @path: path, as seen from mount-point + */ +#define MAKE_REAL_PATH(var, this, path) do { \ + int base_len = ((struct bdb_private *)this->private)->export_path_length; \ + var = alloca (strlen (path) + base_len + 2); \ + strcpy (var, ((struct bdb_private *)this->private)->export_path); \ + strcpy (&var[base_len], path); \ + } while (0) + +/* MAKE_REAL_PATH_TO_STORAGE_DB(var,this,path) + * make the real path to the storage-database file on file-system + * + * @var: destination to hold the real path + * @this: pointer to xlator_t corresponding to bdb xlator + * @path: path of the directory, as seen from mount-point + */ +#define MAKE_REAL_PATH_TO_STORAGE_DB(var, this, path) do { \ + int base_len = ((struct bdb_private *)this->private)->export_path_length; \ + var = alloca (strlen (path) + base_len + strlen (GLFS_BDB_STORAGE)); \ + strcpy (var, ((struct bdb_private *)this->private)->export_path); \ + strcpy (&var[base_len], path); \ + strcat (var, GLFS_BDB_STORAGE); \ + } while (0) + +/* MAKE_KEY_FROM_PATH(key,path) + * make a 'key', which we use as key in the underlying database by using the path + * + * @key: destination to hold the key + * @path: path to file as seen from mount-point + */ +#define MAKE_KEY_FROM_PATH(key, path) do { \ + char *tmp = alloca (strlen (path)); \ + strcpy (tmp, path); \ + key = basename (tmp); \ + }while (0); + +/* BDB_DO_LSTAT(path,stbuf,dirent) + * construct real-path to a dirent and do lstat on the real-path + * + * @path: path to the directory whose readdir is currently in progress + * @stbuf: a 'struct stat *' + * @dirent: a 'struct dirent *' + */ +#define BDB_DO_LSTAT(path, stbuf, dirent) do { \ + char tmp_real_path[GF_PATH_MAX]; \ + strcpy(tmp_real_path, path); \ + strcat (tmp_real_path, "/"); \ + strcat(tmp_real_path, dirent->d_name); \ + ret = lstat (tmp_real_path, stbuf); \ + } while(0); + +/* IS_BDB_PRIVATE_FILE(name) + * check if a given 'name' is bdb xlator's internal file name + * + * @name: basename of a file. + * + * bdb xlator reserves file names 'glusterfs_storage.db', + * 'glusterfs_ns.db'(used by bdb xlator itself), 'log.*', '__db.*' (used by libdb) + */ +#define IS_BDB_PRIVATE_FILE(name) ((!strncmp(name, "__db.", 5)) || \ + (!strcmp(name, "glusterfs_storage.db")) || \ + (!strcmp(name, "glusterfs_ns.db")) || \ + (!strncmp(name, "log.0000", 8))) + +/* check if 'name' is '.' or '..' entry */ +#define IS_DOT_DOTDOT(name) ((!strncmp(name,".", 1)) || (!strncmp(name,"..", 2))) + +/* BDB_SET_BCTX(this,inode,bctx) + * put a stamp on inode. d00d, you are using bdb.. huhaha. + * pointer to 'struct bdb_ctx' is stored in inode's ctx of all directories. + * this will happen either in lookup() or mkdir(). + * + * @this: pointer xlator_t of bdb xlator. + * @inode: inode where 'struct bdb_ctx *' has to be stored. + * @bctx: a 'struct bdb_ctx *' + */ +#define BDB_SET_BCTX(this,inode,bctx) do{ \ + inode_ctx_put(inode, this, (uint64_t)(long)bctx); \ + }while (0); + +/* MAKE_BCTX_FROM_INODE(this,bctx,inode) + * extract bdb xlator's 'struct bdb_ctx *' from an inode's ctx. + * valid only if done for directory inodes, otherwise bctx = NULL. + * + * @this: pointer xlator_t of bdb xlator. + * @bctx: a 'struct bdb_ctx *' + * @inode: inode from where 'struct bdb_ctx *' has to be extracted. + */ +#define MAKE_BCTX_FROM_INODE(this,bctx,inode) do{ \ + uint64_t tmp_bctx = 0; \ + inode_ctx_get (inode, this, &tmp_bctx); \ + if (ret == 0) \ + bctx = (void *)(long)tmp_bctx; \ + }while (0); + +#define BDB_SET_BFD(this,fd,bfd) do{ \ + fd_ctx_set (fd, this, (uint64_t)(long)bfd); \ + }while (0); + +/* maximum number of open dbs that bdb xlator will ever have */ +#define BDB_MAX_OPEN_DBS 100 + +/* convert file size to block-count */ +#define BDB_COUNT_BLOCKS(size,blksize) (((size + blksize - 1)/blksize) - 1) + +/* file permissions, again macros are more readable */ +#define RWXRWXRWX 0777 +#define DEFAULT_FILE_MODE 0644 +#define DEFAULT_DIR_MODE 0755 + +/* see, if have a valid file permissions specification in @mode */ +#define IS_VALID_FILE_MODE(mode) (!(mode & (~RWXRWXRWX))) +#define IS_VALID_DIR_MODE(mode) (!(mode & (~(RWXRWXRWX))) + +/* maximum retries for a failed transactional operation */ +#define BDB_MAX_RETRIES 10 + +typedef struct bctx_table bctx_table_t; +typedef struct bdb_ctx bctx_t; +typedef struct bdb_cache bdb_cache_t; +typedef struct bdb_private bdb_private_t; + +struct bctx_table { + uint64_t dbflags; /* flags to be used for opening each database */ + uint64_t cache; /* cache: can be either ON or OFF */ + gf_lock_t lock; /* used to lock the 'struct bctx_table *' */ + gf_lock_t checkpoint_lock; /* lock for checkpointing */ + struct list_head *b_hash; /* hash table of 'struct bdb_ctx' */ + struct list_head active; /* list of active 'struct bdb_ctx' */ + struct list_head b_lru; /* lru list of inactive 'struct bdb_ctx' */ + struct list_head purge; + uint32_t lru_limit; + uint32_t lru_size; + uint32_t hash_size; + DBTYPE access_mode; /* access mode for accessing the databases, + * can be DB_HASH, DB_BTREE */ + DB_ENV *dbenv; /* DB_ENV under which every db operation + * is carried over */ + int32_t transaction; + xlator_t *this; + + uint64_t page_size; /* page-size of DB, + * DB->set_pagesize(), should be set before DB->open */ +}; + +struct bdb_ctx { + /* controller members */ + struct list_head list; /* lru list of 'struct bdb_ctx's, + * a bdb_ctx can exist in one of b_hash or lru lists */ + struct list_head b_hash; /* directory 'name' hashed list of 'struct bdb_ctx's */ + + struct bctx_table *table; + int32_t ref; /* reference count */ + gf_lock_t lock; /* used to lock this 'struct bdb_ctx' */ + + char *directory; /* directory path */ + DB *dbp; /* pointer to open database, that resides inside this directory */ + uint32_t cache; /* cache ON or OFF */ + + /* per directory cache, bdb xlator's internal cache */ + struct list_head c_list; /* linked list of cached records */ + int32_t c_count; /* number of cached records */ + + int32_t key_hash; /* index to hash table list, to which this ctx belongs */ + char *db_path; /* absolute path to db file */ +}; + +struct bdb_fd { + struct bdb_ctx *ctx; /* pointer to bdb_ctx of the parent directory */ + char *key; /* name of the file. NOTE: basename, not the complete path */ + int32_t flags; /* open flags */ +}; + +struct bdb_dir { + struct bdb_ctx *ctx; /* pointer to bdb_ctx of this directory */ + DIR *dir; /* open directory pointer, as returned by opendir() */ + char offset[NAME_MAX]; /* FIXME: readdir offset, too crude. must go */ + char *path; /* path to this directory */ +}; + +/* cache */ +struct bdb_cache { + struct list_head c_list; /* list of 'struct bdb_cache' under a 'struct bdb_ctx' */ + char *key; /* name of the file this cache holds. NOTE: basename of file */ + char *data; /* file content */ + size_t size; /* size of the file content that this cache holds */ +}; + + +struct bdb_private { + inode_table_t *itable; /* pointer to inode table that we use */ + int32_t temp; /**/ + char is_stateless; /**/ + char *export_path; /* path to the export directory + * (option directory <export-path>) */ + int32_t export_path_length; /* length of 'export_path' string */ + + /* statistics */ + struct xlator_stats stats; /* Statistics, provides activity of the server */ + + struct timeval prev_fetch_time; + struct timeval init_time; + int32_t max_read; /* */ + int32_t max_write; /* */ + int64_t interval_read; /* Used to calculate the max_read value */ + int64_t interval_write; /* Used to calculate the max_write value */ + int64_t read_value; /* Total read, from init */ + int64_t write_value; /* Total write, from init */ + + /* bdb xlator specific private data */ + uint64_t envflags; /* flags used for opening DB_ENV for this xlator */ + uint64_t dbflags; /* flags to be used for opening each database */ + uint64_t cache; /* cache: can be either ON or OFF */ + uint32_t transaction; /* transaction: can be either ON or OFF */ + uint32_t active; + gf_lock_t active_lock; + struct bctx_table *b_table; + DBTYPE access_mode; /* access mode for accessing the databases, + * can be DB_HASH, DB_BTREE + * (option access-mode <mode>) */ + mode_t file_mode; /* mode for each and every file stored on bdb + * (option file-mode <mode>) */ + mode_t dir_mode; /* mode for each and every directory stored on bdb + * (option dir-mode <mode>) */ + mode_t symlink_mode; /* mode for each and every symlink stored on bdb */ + pthread_t checkpoint_thread; /* pthread_t object used for creating checkpoint + * thread */ + int32_t checkpoint_timeout; /* time duration between two consecutive checkpoint + * operations. + * (option checkpoint-timeout <time-in-seconds>) */ + ino_t next_ino; /* inode number allocation counter */ + gf_lock_t ino_lock; /* lock to protect 'next_ino' */ + char *logdir; /* environment log directory + * (option logdir <directory>) */ + char *errfile; /* errfile path, used by environment to + * print detailed error log. + * (option errfile <errfile-path>) */ + FILE *errfp; /* DB_ENV->set_errfile() expects us to fopen + * the errfile before doing DB_ENV->set_errfile() */ + uint32_t txn_timeout; /* used by DB_ENV->set_timeout to set the timeout for + * a transactionally encapsulated DB->operation() to + * timeout before waiting for locks to be released. + * (option transaction-timeout <time-in-milliseconds>) + */ + uint32_t lock_timeout; + uint32_t log_auto_remove; /* DB_AUTO_LOG_REMOVE flag for DB_ENV*/ + uint32_t log_region_max; +}; + + +static inline int32_t +bdb_txn_begin (DB_ENV *dbenv, + DB_TXN **ptxnid) +{ + return dbenv->txn_begin (dbenv, NULL, ptxnid, 0); +} + +static inline int32_t +bdb_txn_abort (DB_TXN *txnid) +{ + return txnid->abort (txnid); +} + +static inline int32_t +bdb_txn_commit (DB_TXN *txnid) +{ + return txnid->commit (txnid, 0); +} + +inline void * +bdb_extract_bfd (fd_t *fd, xlator_t *this); + + +void * +bdb_db_stat (bctx_t *bctx, + DB_TXN *txnid, + uint32_t flags); + +int32_t +bdb_db_get(struct bdb_ctx *bctx, + DB_TXN *txnid, + const char *key_string, + char **buf, + size_t size, + off_t offset); + +#define BDB_TRUNCATE_RECORD 0xcafebabe + +int32_t +bdb_db_put (struct bdb_ctx *bctx, + DB_TXN *txnid, + const char *key_string, + const char *buf, + size_t size, + off_t offset, + int32_t flags); + +int32_t +bdb_db_del (struct bdb_ctx *bctx, + DB_TXN *txnid, + const char *path); + +ino_t +bdb_inode_transform (ino_t parent, + struct bdb_ctx *bctx); + + +int32_t +bdb_cursor_open (struct bdb_ctx *bctx, + DBC **cursorp); + +int32_t +bdb_cursor_get (DBC *cursorp, + DBT *key, + DBT *value, + int32_t flags); + + +int32_t +bdb_cursor_close (struct bdb_ctx *ctx, + DBC *cursorp); + + +int32_t +bdb_dirent_size (DBT *key); + +int32_t +dirent_size (struct dirent *entry); + +int +bdb_db_init (xlator_t *this, + dict_t *options); + +void +bdb_dbs_from_dict_close (dict_t *this, + char *key, + data_t *value, + void *data); + +bctx_t * +bctx_lookup (struct bctx_table *table, + const char *path); + +bctx_t * +bctx_parent +(struct bctx_table *table, + const char *path); + +bctx_t * +bctx_unref (bctx_t *ctx); + +bctx_t * +bctx_ref (bctx_t *ctx); + +bctx_t * +bctx_rename (bctx_t *bctx, + const char *db_newpath); + +int32_t +bdb_db_rename (bctx_table_t *table, + const char *tmp_db_newpath, + const char *real_db_newpath); +#endif /* _BDB_H */ |